Malicious PDF — malware analysis report

Static analysis result for SHA-256 1681022669c9d2e9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 00:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7cfa739f627707830e59fb89d379394 SHA-1: 1d11004a325ed624e46f92ce5e4fd61a59aab36d SHA-256: 1681022669c9d2e9bf2722b6ecf508cc1d4b0465c67441584a76b4f17b49ec9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised websites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, as suggested by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=android+17+super
    • http://quangcaosmsgiare.com/media/ftp/file/zebazijonowi.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/87363963190.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5a99a18f---83671606017.pdf
    • http://vetportonaccio.it/userfiles/files/sazefukojox.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/25071398665.pdf
    • http://sllight.ru/design/img/upload/file/wekugimubipegukemu.pdf
    • http://thekitchendesignstudio.org/uploads/files/lutitazitokepojefedab.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/73877227296.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/zevefoginimopobisop.pdf
    • http://we-women.de/default/files/uploads/file/kumivaso.pdf
    • http://poultech.net/d/files/durudiv.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a08ebced42---dijadoturabote.pdf
    • http://cukrarska-vyroba.cz/UserFiles/File/84326245064.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f4a0cf5ec0bba47649443e939f0274dc/78713006979.pdf
    • http://garantc.ru/userfiles/file/lezusudojofobapuroj.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/90983602057.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/97155853522.pdf
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/69346047496.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/91534720598.pdf
    • http://peneleos.pl/userfiles/file/15842627468.pdf
    • https://allcreaturesinc.com/files/files/53915521400.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/97015521883.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adf4.bin
eefe1dc58c3b106216a692192fa03e2583efd1f68d6fb2145d192b417392cdcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADF4 15204 bytes
font_01_sfnt_off0000d426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 16792 bytes
font_02_sfnt_off0000ec3d.bin
0c58ee3402505d2011575175bc08f43d7ea84257c4e5b6ea0e79f3b4ec5211ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 10264 bytes

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